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DENT 656 – Orthodontics

DENT 656 – Orthodontics. Removable and myofunctional appliances. Sarandeep Huja huja.1@osu.edu. Topics. Removable Appliances Including retainers Myofunctional Appliances - Including Head Gear Removable-Fixed Appliance (aka Passive Fixed). Development of Removable Appliances.

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DENT 656 – Orthodontics

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  1. DENT 656 – Orthodontics Removable and myofunctional appliances Sarandeep Huja huja.1@osu.edu

  2. Topics • Removable Appliances • Including retainers • Myofunctional Appliances - Including Head Gear • Removable-Fixed Appliance (aka Passive Fixed)

  3. Development of Removable Appliances • US - Jackson, Crozat • Europe – Andresen, Haupl, Schwartz • Dichoctomy existed till 1970’s • Primary use • Growth modification • Limited tooth movements, tipping – no bodily control • Retention

  4. Removable appliances • Used to expand arches (usually maxilla, not mandible). • Open jackscrew 0.25 mm (1/4 turn), not exceed 1mm/month • Fingersprings – more gentle movement than jackscrew • Retention of removable appliances is critical (anchorage) • Main use today is as retainers, biteplates for crossbite corrections • Some functional appliances are used, but claims of early 70’s not substantiated in randomized clincial trials

  5. Removable Appliances

  6. Components • Retentive • Active

  7. Components C Clasp and Labial Bow

  8. Active component Fingerspring

  9. Bite Plate Correction of deep bite

  10. Removable Appliances Lower arch expansion Distalizing molars

  11. Retainers used post-fixed appliances • They are usually removable • Can be fixed

  12. Hawley appliance * Labial bow, Adams or C clasp

  13. Springretainer

  14. Tooth positioner Invisalign

  15. Myofunctional appliances History Theoretical Basis

  16. Activator/Bionator* Cl II malocclusions Developed in Europe Dental and skeletal effects

  17. Activator/Headgear Combination Hybrid appliance, add what you need Lip bumper Torquing wires

  18. Frankel Appliance Buccal shields Lip pads Lingual plate

  19. Herbst Appliance Commonly used Has dental and skeletal effects Patient compliance not required

  20. Jasper Jumper and Lip Bumper

  21. Active Vertical Corrector and Twin Block Repelling magnets Postures mandible forward

  22. Headgear Myofunctional Anchorage for fixed appliances

  23. Headgear Cervical pull High pull

  24. Headgear* – Combi pull and J Hook Usually HG facebow attached to molar tubes J hook directly to soldered hooks on archwire

  25. Face Mask or Reverse Pull HG Used in maxillary deficient cases Cl III due to retrognathic maxillas

  26. Fixed Removable Appliances • Aka Fixed Passive

  27. Upper Hyrax* and Lower Expansion* Upper appliance used prior to age ~ 13, before the midpalatal suture gets interdigitated, get skeletal effects Lower arch – only tipping movement of teeth

  28. Palatal and Lingual Arch* Very commonly used to reinforce anchorage with fixed appliance; 036 SS wire Connects the transverse dimension, and helps in expansion and root movements

  29. Quad Helix* with Finger Springs and W arch Expansion appliances Maxillary expansion more common than mandibular Increase in length of wire by forming helices, 040 wire

  30. Pendulum appliance Bonded to premolars Uses TMA wire with helices molar tubes Anchorage from palate Primarily molar movement, but Movement of anteriors

  31. Habit appliance* Tongue or digit habit

  32. Questions

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